Optical sensor systems having sensor and detection modules

ABSTRACT

In some examples, an image sensor system comprises a source module including a source housing having a source window and a source shielding member, the source module to emit a detection signal through the source window. the source shielding member surrounding the source window and extending in an outward direction from the source window. The image sensor system further comprises a detection module including a detection housing having a detection window and a detection shielding member, the detection module spaced apart from the source module and to detect the detection signal emitted from the source module and passed through the detection window, the detection shielding member surrounding the detection window and extending in an outward direction from the detection window.

CROSS REFERENCE TO RELATED APPLICATIONS

This is a continuation of U.S. application Ser. No. 13/238,281, filedSep. 21, 2011, which is related to U.S. application Ser. No. 13/238,015,filed Sep. 21, 2011, now U.S. Pat. No. 9,110,007, and U.S. applicationSer. No. 13/238,001, filed Sep. 21, 2011, now U.S. Pat. No. 8,653,439.All of the foregoing applications are incorporated herein by referencein their entirety.

BACKGROUND

Optical sensor systems may include source modules and detection modulesto detect the presence of objects there between. The source modules mayinclude a source window member to emit a detection signal such as aninfrared signal there through to be received by a detection modulethrough a detection window member thereof. The objects such as volatileorganic compounds (VOC) may be detected present in a path of thedetection signal. Such optical sensor systems may be included in imageforming apparatuses, air quality monitoring devices, or the like.

BRIEF DESCRIPTION OF THE DRAWINGS

Non-limiting examples of the present disclosure are described in thefollowing description, read with reference to the figures attachedhereto and do not limit the scope of the claims. In the figures,identical and similar structures, elements or parts thereof that appearin more than one figure are generally labeled with the same or similarreferences in the figures in which they appear. Dimensions of componentsand features illustrated in the figures are chosen primarily forconvenience and clarity of presentation and are not necessarily toscale. Referring to the attached figures:

FIG. 1 is a block diagram illustrating an optical sensor systemaccording to an example.

FIG. 2A is a side view illustrating the optical sensor system of FIG. 1according to an example.

FIG. 2B is a top view of the optical sensor system of FIG. 2A accordingto an example.

FIGS. 3A and 3C are front views of a source module of the optical sensorsystem of FIG. 2A according to examples.

FIGS. 3B and 3D are front views of a detection module of the opticalsensor system of FIG. 2A according to examples.

FIG. 4 is a block diagram illustrating an image forming apparatus havingan optical sensor system according to an example.

FIG. 5 is a flowchart illustrating a method of detecting volatileorganic compounds according to an example.

DETAILED DESCRIPTION

In the following detailed description, reference is made to theaccompanying drawings which form a part hereof, and in which is depictedby way of illustration specific examples in which the present disclosuremay be practiced. It is to be understood that other examples may beutilized and structural or logical changes may be made without departingfrom the scope of the present disclosure. The following detaileddescription, therefore, is not to be taken in a limiting sense, and thescope of the present disclosure is defined by the appended claims.

Optical sensor systems may include source modules and detection modulesto detect the presence of objects there between such as volatile organiccompounds (VOC). For example, VOC may be in a form of a gas, liquidand/or solid and include organic compounds that may easily become vaporor gaseous. An optical sensor system may detect VOC in a form of a gasin a volume of air between a source module and a detection module, forexample, to be used as a basis for determining a total amount of VOC ina form of a gas present in an environment. Such information may be usedto provide alerts based on VOC concentration and/or activate processesto reduce VOC concentration. The source modules may include a sourcewindow member to emit a detection signal such as an infrared signalthere through to be received by a detection module through a detectionwindow member thereof. The objects, for example, such as VOC may bedetected when present in path of the detection signal. Such opticalsensor systems may be included in image forming apparatuses, air qualitymonitoring devices, or the like. The image forming apparatuses mayinclude liquid electrophotography printing apparatuses to form images onan image transfer blanket that, subsequently, get transferred to media.Unwanted deposits in a form of solid and/or liquid buildup such as VOCdeposits, however, may form on the source window member and thedetection window member. The deposits may decrease transmission of thedetection signal through the respective window members, for example, byabsorbing some frequencies of the detection signal and/or promotingscattering due to non-uniformity of the thickness of the deposits.Consequently, the detection signal may be degraded and/or potentiallydistort detection of objects such as the VOC in a form of gas present inthe path of the detection signal resulting in incorrect VOC reading bythe detection module.

In examples, an optical sensor system includes, amongst other things, asource module including a source housing unit and a detection moduleincluding a detection housing unit. The source housing unit includes asource window member and a source shielding member. The source moduleemits a detection signal through the source window member. The detectionhousing unit includes a detection window member and a detectionshielding member. The detection module detects the detection signalemitted from the source module thereto. The source shielding membersurrounds the source window member and extends in an outward directionfrom the source window member. The detection shielding member surroundsthe detection window member and extends in an outward direction from thedetection window member. The shielding members may reduce and/or delaydeposit formation of VOC on the corresponding window members that therespective shielding members surround. Thus, degradation of thedetection signal and/or potentially distortion of the detection ofobjects such as the VOC in the form of gas present in the path of thedetection signal due to deposit formation on respective window membersmay be reduced.

FIG. 1 is a block diagram illustrating an optical sensor systemaccording to an example. Referring to FIG. 1, in some examples, anoptical sensor system 100 includes a source module 11 and a detectionmodule 14. The source module 11 includes a source housing unit 12 havinga source window member 12 a and a source shielding member 12 b. Thesource shielding member 12 b surrounds the source window member 12 a andextends in an outward direction d_(so) (FIGS. 2A and 2B) from the sourcewindow member 12 a. The source module 11 may emit a detection signalthrough the source window member 12 a. The detection module 14 is spacedapart from the source module 11. The detection module 14 includes adetection housing unit 15 having a detection window member 15 a and adetection shielding member 15 b. The detection shielding member 15 bsurrounds the detection window member 15 a and extends in an outwarddirection d_(do) from the detection window member 15 a.

FIG. 2A is a side view illustrating the optical sensor system of FIG. 1according to an example. FIG. 2B is a top view illustrating the opticalsensor system of FIG. 2A according to an example. FIGS. 3A and 3C arefront views of a source module of the optical sensor system of FIG. 2Aaccording to examples. FIGS. 3B and 3D are front views of a detectionmodule of the optical sensor system of FIG. 2A according to examples.Referring to FIGS. 2A-3D, in some examples, the source window member 12a includes a source perimeter p_(s) and the detection window member 15 aincludes a detection perimeter p_(d), for example, generallyperpendicular to a direction of the detection signal emitted from thesource module 11. In some examples, the source shielding member 12 b maysurround the entire source perimeter p_(s) of the source window member12 a perpendicular to a direction of the detection signal emitted by thesource module 11. Additionally, the detection shielding member 15 b maysurround the entire perimeter p_(d) of the detection window member 15 aperpendicular to the direction of the detection signal emitted by thesource module 11. Perimeters p_(s) and p_(d) may be selected to minimizean amount of signal that the respective shielding members 12 b and 15 bmay intersect. For example, the perimeters p_(s) and p_(d) may be atleast of a size of the source module window member 12 a and thedetection module window member 15 a, respectively. Elongated bodies 12 fand 15 f of the source shielding member 12 b and the detection shieldingmember 15 b may include an outer surface surrounding the sourceperimeter p_(s) and the detection perimeter d_(s), respectively, havinga variety of shapes including a rectangular shape and a circular shape.

Referring to FIGS. 2A-3D, in some examples, each one of the sourceshielding member 12 b and the detection shielding member 15 b mayinclude an elongated body 12 f and 15 f. The respective elongated bodies12 f and 15 f may include a longitudinal opening 12 c and 15 c extendingtherein. That is, the longitudinal opening 12 c may extend throughoutthe elongated body 12 f of the respective shielding member 12 b to allowthe detection signal to pass there through. For example, across-sectional area of the longitudinal opening 12 c and 15 c of theelongated body 12 f and 15 f of each of the source shielding member 12 band the detection shielding member 15 perpendicular to a direction ofthe detection signal emitted by the source module 11 are greater than across-sectional area of the source window member 12 a and the detectionwindow member 15 a. Thus, the detection signal may pass there throughwithout the respective shielding members 12 b and 15 b obstructingand/or degrading the detection signal.

Referring to FIGS. 2A-3D, in some examples, the detection module 14 maydetect VOC 22 present in the path of the detection signal between thesource module 11 and the detection module 14. Thus, the source shieldingmember 12 b may reduce deposit formation of the VOC on the source windowmember 12 a and the detection shielding member 15 b may reduce depositformation of the VOC on the detection window member 15 a. For example,the elongated body 12 f and 15 f of the source shielding member 12 b andthe detection shielding member 15 b may be disposed traverse to adirection of air flow d_(f) transporting the VOC 22. For example, airflow may be created by exhaust fans, fans providing air circulationexternal and proximate to the optical sensor system 100 such as devicesincluding the optical sensor system 100, hot air convection external andproximate to the optical sensor system 100 such as devices including theoptical sensor system 100, or the like. Thus, the respective elongatedbodies 12 f and 15 f may block the air flow from directly contacting thesource window member 12 a and the detection window member 15 a,respectively, in an uninterrupted manner. That is, the respectiveelongated bodies 12 f and 15 f reduce the number of direct paths for theVOC to contact the source window member 12 a and the detection windowmember 15 a.

Referring to FIGS. 2A-3D, in some examples, the optical sensor system100 may include at least one guide member 25 to guide the source housingunit 12 and the detection housing unit 15 toward and away from eachother to adjust a distance there between. For example, the opticalsensor system 100 may include a pair of guide members 25 disposedthrough each of the source housing unit 12 and the detection housingunit 15 to allow the respective housing members 12 a and 15 a to slidetoward and away from each other along the guide members 25.Alternatively, the optical sensor system 100 may include a solid memberconnecting the source housing unit 12 and the detection housing unit 15to provide a rigid structure and permanent alignment for the sourcemodule 11, detection module 14, and parts thereof.

In some examples, the source module 11 and/or the detection module 14may be implemented in hardware, or in a combination of hardware andsoftware. In some examples, the source module 11 and the detectionmodule 14 may be implemented in part as a computer program such as a setof machine-readable instructions stored in the optical sensor system 100locally or remotely. For example, the computer program may be stored ina memory such as a server or a host computing device considered hereinas part of the optical sensor system 100.

FIG. 4 is a block diagram illustrating an image forming apparatusincluding an optical sensor system according to an example. In someexamples, the image forming apparatus 400 may include a liquidelectrophotograpy printing apparatus that forms images on media byapplying fluid onto an intermediate transfer member and, subsequently,onto the media. For example, the fluid may include ink such as liquidtoner, for example, ElectroInk, trademarked by Hewlett-Packard Companyincluding imaging oil. The imaging oil may include low weight liquidaliphatic hydrocarbons, for example, Isopar, trademarked by ExxonCorporation. Referring to FIG. 4, in some examples, an image formingapparatus 400 includes a fluid applicator unit 48 and an optical sensorsystem 100. The fluid applicator unit 48 may apply fluid to an object toform an image. For example, the fluid applicator unit 48 may include aninkjet print head, a binary developer unit, or the like. In someexamples, the image forming apparatus 400 may include the optical sensorsystem 100 as previously disclosed with respect to FIGS. 1-3D.

Referring to FIG. 4, in some examples, the optical sensor system 100 maydetect VOC formed from the fluid applied by the fluid applicator unit48. The optical sensor system 100 may include a source module 11 and adetection module 14 spaced apart from each other. For example, thesource module 11 may include a source housing unit 12 having a sourcewindow member 12 a and a source shielding member 12 b. The source module11 may emit a detection signal through the source window member 12 a todetect the VOC present in the path of a detection signal between thesource module 11 and the detection module 14. The source shieldingmember 12 b may surround and extend in an outward direction d_(so) fromthe source window member 12 a to reduce deposit formation of the VOC onthe source window member 12a.

Referring to FIG. 4, in some examples, the detection module 14 mayinclude a detection housing unit 15 having a detection window member 15a and a detection shielding member 15 b to receive the detection signalemitted from the source module 11 at the detection window member 15 a.The detection shielding member 15 b may surround and extend in anoutward direction d_(do) from the detection window member 15 a to reducedeposit formation of the VOC on the detection window member 15 a. Forexample, the elongated body 12 f and 15 f of the source shielding member12 b and the detection shielding member 15 b are disposed traverse to adirection of air flow d_(f) transporting the VOC to block the air flowfrom directly contacting the source window member 12 a and the detectionwindow member 15 a, respectively, in an uninterrupted manner.

FIG. 5 is a flowchart illustrating a method of detecting volatileorganic compounds according to an example. Referring to FIG. 5, in blockS510, a detection signal is emitted by a source module through a sourcewindow member thereof. In block S520, the detection signal is receivedby a detection module spaced apart from the source module through adetection window member thereof. In block S530, deposit formation of VOCon the source window member is reduced by a source shielding member ofthe source module surrounding and extending in an outward direction fromthe source window member. The reducing of deposit formation of the VOCon the source window member may also include blocking air flowtransporting the VOC from directly contacting the source window memberin an uninterrupted manner by an elongated body of the source shieldingmember disposed traverse to a direction of the air flow. In block S540,deposit formation of the VOC on the detection window member is reducedby a detection shielding member of the detection module surrounding andextending in an outward direction from the detection window member. Thereducing deposit formation of the VOC on the detection window member mayalso include blocking air flow transporting the VOC from directlycontacting the detection window member in an uninterrupted manner by anelongated body of the detection shielding member disposed traverse to adirection of the air flow. In block S550, the volatile organic compoundspresent in a path of the detection signal between the source module andthe detection module are detected.

It is to be understood that the flowchart of FIG. 5 illustrates anarchitecture, functionality, and operation of an example of the presentdisclosure. If embodied in software, each block may represent a module,segment, or portion of code that includes one or more executableinstructions to implement the specified logical function(s). If embodiedin hardware, each block may represent a circuit or a number ofinterconnected circuits to implement the specified logical function(s).Although the flowchart of FIG. 5 illustrates a specific order ofexecution, the order of execution may differ from that which isdepicted. For example, the order of execution of two or more blocks maybe scrambled relative to the order illustrated. Also, two or more blocksillustrated in succession in FIG. 5 may be executed concurrently or withpartial concurrence. All such variations are within the scope of thepresent disclosure.

The present disclosure has been described using non-limiting detaileddescriptions of examples thereof and is not intended to limit the scopeof the present disclosure. It should be understood that features and/oroperations described with respect to one example may be used with otherexamples and that not all examples of the present disclosure have all ofthe features and/or operations illustrated in a particular figure ordescribed with respect to one of the examples. Variations of examplesdescribed will occur to persons of the art. Furthermore, the terms“comprise,” “include,” “have” and their conjugates, shall mean, whenused in the present disclosure and/or claims, “including but notnecessarily limited to.”

It is noted that some of the above described examples may includestructure, acts or details of structures and acts that may not beessential to the present disclosure and are intended to be exemplary.Structure and acts described herein are replaceable by equivalents,which perform the same function, even if the structure or acts aredifferent, as known in the art. Therefore, the scope of the presentdisclosure is limited only by the elements and limitations as used inthe claims.

What is claimed is:
 1. An optical sensor system, comprising: a sourcemodule including a source housing having a source window and a sourceshielding member, the source module to emit a detection signal throughthe source window. the source shielding member surrounding the sourcewindow and extending in an outward direction from the source window; adetection module including a detection housing having a detection windowand a detection shielding member, the detection module spaced apart fromthe source module and to detect the detection signal emitted from thesource module and passed through the detection window, the detectionshielding member surrounding the detection window and extending in anoutward direction from the detection window; and a guide member betweenthe source module and the detection module, the source module and thedetection module slideable along the guide member to adjust a distancebetween the source module and the detection module.
 2. The opticalsensor system according to claim 1, wherein the guide member comprisesan elongated guide along which the source module and the detectionmodule are slideable.
 3. The optical sensor system according to claim 1,wherein the source shielding member surrounds an entire perimeter of thesource window perpendicular to a direction of the detection signalemitted by the source module, and the detection shielding membersurrounds an entire perimeter of the detection window perpendicular tothe direction of the detection signal emitted by the source module. 4.The optical sensor system according to claim 3, wherein each of thesource shielding member and the detection shielding member comprises anelongated body having a longitudinal opening through which the detectionsignal is to pass.
 5. The optical sensor system according to claim 4,wherein each of the respective elongated bodies of the source shieldingmember and the detection shielding member has a cross section that iscircularly shaped.
 6. The optical sensor system according to claim 4,wherein each of the respective elongated bodies of the source shieldingmember and the detection shielding member has a cross section that isrectangularly shaped.
 7. The optical sensor system according to claim 4,wherein a cross-sectional area of the longitudinal opening of theelongated body of the source shielding member is greater than across-sectional area of the source window, and a cross-sectional area ofthe longitudinal opening of the elongated body of the detectionshielding member is greater than a cross-sectional area of the detectionwindow.
 8. The optical sensor system according to claim 1, wherein thedetection module is to detect volatile organic compounds (VOC) presentin a path of the detection signal between the source module and thedetection module.
 9. The optical sensor system according to claim 8,wherein the detection signal is to propagate along a first directionthat is perpendicular to a second direction of fluid flow thattransports the VOC for detection by the optical sensor system.
 10. Theoptical sensor system according to claim 9, wherein an elongated body ofthe source shielding member and an elongated body of the detectionshielding member are disposed traverse to a direction of the fluid flowtransporting the VOC to block the fluid flow from directly contactingthe source window and the detection window, respectively.
 11. An opticalsensor system, comprising: a source module including a source housinghaving a source window and a source shielding member, the source moduleto emit a detection signal through the source window along a firstdirection, the source shielding member surrounding the source window andextending in an outward direction from the source window; and adetection module including a detection housing having a detection windowand a detection shielding member, the detection module spaced apart fromthe source module and to detect the detection signal emitted from thesource module along the first direction and passed through the detectionwindow member, the detection shielding member surrounding the detectionwindow and extending in an outward direction from the detection window,wherein the first direction is perpendicular to a second direction offluid flow that transports a material for detection by the opticalsensor system.
 12. The optical sensor system according to claim 11,further comprising a guide member between the source module and thedetection module, the source module and the detection module slideablealong the guide member to adjust a distance between the source moduleand the detection module.
 13. The optical sensor system according toclaim 11, wherein each of the source shielding member and the detectionshielding member comprises an elongated body having a longitudinalopening through which the detection signal is to pass.
 14. The opticalsensor system according to claim 13, wherein each of the respectiveelongated bodies of the source shielding member and the detectionshielding member has a cross section that is circularly shaped.
 15. Theoptical sensor system according to claim 13, wherein each of therespective elongated bodies of the source shielding member and thedetection shielding member has a cross section that is rectangularlyshaped.
 16. The optical sensor system according to claim 11, wherein thedetection module is to detect volatile organic compounds present in apath of the detection signal between the source module and the detectionmodule.
 17. An image forming apparatus comprising: a fluid applicator toapply fluid to an object to form an image; and an optical sensor systemto detect a material in the fluid applied by the fluid applicator, theoptical sensor system comprising: a source module including a sourcehousing having a source window and a source shielding member, the sourcemodule to emit a detection signal through the source window. the sourceshielding member surrounding the source window and extending in anoutward direction from the source window; a detection module including adetection housing having a detection window and a detection shieldingmember, the detection module spaced apart from the source module and todetect the detection signal emitted from the source module and passedthrough the detection window, the detection shielding member surroundingthe detection window and extending in an outward direction from thedetection window; and a guide member between the source module and thedetection module, the source module and the detection module slideablealong the guide member to adjust a distance between the source moduleand the detection module.
 18. The image forming apparatus according toclaim 17, wherein a first direction along which the detection signal isto propagate is perpendicular to a second direction of the fluid flowthat transports the material for detection by the optical sensor system.19. The image forming apparatus according to claim 17, wherein each oneof the source shielding member and the detection shielding membercomprise an elongated body having a longitudinal opening through whichthe detection signal is to propagate.
 20. The image forming apparatusaccording to claim 11, wherein the fluid comprises a liquid aliphatichydrocarbon fluid, and the material comprises volatile organiccompounds.